Click image to enlarge.

Polar's Visible Imaging System [also in High-Resolution]
This pair of images in visible light compares the northern auroral
regions on May 11, 1999, and a more typical day on November 13, 1999.
Credit: University of Iowa/NASA

Click image to enlarge.

Data Visualization during the "polar rain"Data visualization of the X ray emissions over the North Pole during the
"polar rain" of electrons on May 11, 1999. The emissions were detected
by the PIXIE instrument on NASA's Polar spacecraft.

Click image to enlarge.

Movies

Animation: The Day the Solar Wind Disappeared (9.4MB)
As the solar wind dissipates on May 11, 1999, the magnetosphere and bow
shock around Earth expand to five times their normal size. The aurora,
which usually forms ovals around Earth's poles, fills in over the
northern polar cap.
Credit: NASA -- Created by AlliedSignal, MaxQ
Digital Group

Computer Model: Interaction of the Solar Wind and Magnetosphere (1.7MB)
A computer model driven by science data shows Earth's bow shock -- the
leading, colored edge to the left -- stretching out toward the Sun as
solar wind density drops. The magnetosphere (gray shading) changes from
a windsock shape to a dipole.
Credit: University of Maryland Advanced Visualization Laboratory/NASA

Movie: SOHO's View of the Sun (3.2MB)
Extreme ultraviolet images of the Sun from the Solar and Heliospheric
Observatory (SOHO) revealed nothing unusual during the interval from May
9-11, 1999.
Credit: European Space Agency/NASA